72
GTN 725/750 Cockpit Reference Guide (CRG)
190-01007-04 Rev. C
Messages
Message
Description
Action
TRANSPONDER 2-
Transponder 2
is inoperative or
connection to GTN is
lost.
The GTN is confi gured for
transponder 1 or 2 but is
not able to communicate
with the transponder.
Verify squawk code and
altitude with ATC. Contact
dealer for service.
TRANSPONDER 1-
ADS-B is not
transmitting position.
The transponder has
insuffi cient data to
support ADS-B.
Ensure the aircraft has
a clear view of the sky.
Contact dealer for service.
TRANSPONDER 2-
ADS-B is not
transmitting position.
The transponder has
insuffi cient data to
support ADS-B.
Ensure the aircraft has
a clear view of the sky.
Contact dealer for service.
TRUE NORTH
APPROACH-
Verify NAV Angles
are referenced to True
North (°T).
A procedure is loaded
that is referenced to true
north and the active leg
has a published true north
reference.
Verify the NAV Angle is set
to True North.
VERTICAL
CALCULATOR-
Approaching target
altitude. Start descent.
User has confi gured
a vertical descent
calculation, and the
aircraft is within 60
seconds of the calculated
top of descent.
No action is necessary;
message is informational
only.
VERTICAL
CALCULATOR-
Approaching target
altitude.
User has confi gured
a vertical descent
calculation, and the
aircraft is approaching the
target altitude.
No action is necessary;
message is informational
only.
VLOC RECEIVER-
Navigation receiver
needs service.
The NAV radio is reporting
that it needs service. The
NAV radio may continue
to function.
Use GPS based navigation.
Contact dealer for service.
VLOC RECEIVER-
Navigation receiver has
failed.
The NAV radio is not
communicating property
with the system.
Use GPS based navigation.
Contact dealer for service.
Summary of Contents for GTN 725
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